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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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y4mdec: Simplify header parsing
Use string parsing instead of pointer arithmetic, which makes the code easier to understand and less error-prone. This has no functional changes, and is preparation for the next commit, which extends the header parsing. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5997>
This commit is contained in:
Nirbheek Chauhan
GStreamer Marge Bot
parent
7c1ea2eeab
commit
968ebd26ab
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@ -287,117 +287,124 @@ gst_y4m_dec_bytes_to_timestamp (GstY4mDec * y4mdec, gint64 bytes)
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gst_y4m_dec_bytes_to_frames (y4mdec, bytes));
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}
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static gboolean
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parse_colorspace (const char *param, GstVideoFormat * format)
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{
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gulong iformat = strtoul (param, NULL, 10);
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switch (iformat) {
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case 420:
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*format = GST_VIDEO_FORMAT_I420;
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break;
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case 422:
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*format = GST_VIDEO_FORMAT_Y42B;
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break;
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case 444:
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*format = GST_VIDEO_FORMAT_Y444;
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break;
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default:
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return FALSE;
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}
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return TRUE;
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}
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static gboolean
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parse_ratio (const char *param, gulong * n, gulong * d)
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{
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char *end;
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*n = strtoul (param, &end, 10);
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if (end == param)
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return FALSE;
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param = end;
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if (param[0] != ':')
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return FALSE;
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param++;
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*d = strtoul (param, &end, 10);
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if (end == param)
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return FALSE;
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return TRUE;
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}
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static gboolean
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gst_y4m_dec_parse_header (GstY4mDec * y4mdec, char *header)
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{
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char *end;
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int iformat = 420;
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int interlaced_char = 0;
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gint fps_n = 0, fps_d = 0;
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gint par_n = 0, par_d = 0;
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gint width = 0, height = 0;
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GstVideoFormat format;
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guint len;
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char *valid;
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char **params;
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const char *end;
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guint interlaced_char = 0;
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gulong fps_n = 0, fps_d = 0;
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gulong par_n = 0, par_d = 0;
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gulong width = 0, height = 0;
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GstVideoFormat format = GST_VIDEO_FORMAT_I420;
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if (memcmp (header, "YUV4MPEG2 ", 10) != 0) {
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GST_ERROR_OBJECT (y4mdec, "y4m start code not found");
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return FALSE;
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}
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header += 10;
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while (*header) {
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GST_DEBUG_OBJECT (y4mdec, "parsing at '%s'", header);
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switch (*header) {
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case ' ':
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header++;
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break;
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g_utf8_validate (header, -1, &end);
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if (header == end) {
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GST_ERROR_OBJECT (y4mdec, "Empty y4m header");
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return FALSE;
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}
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valid = g_strndup (header, end - header);
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GST_INFO_OBJECT (y4mdec, "Found header: %s", valid);
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params = g_strsplit (valid, " ", -1);
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g_free (valid);
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len = g_strv_length (params);
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for (int i = 0; i < len; i++) {
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const char *param = params[i];
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char param_type = *param;
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const char *param_value = param + 1;
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switch (param_type) {
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case 'C':
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header++;
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iformat = strtoul (header, &end, 10);
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if (end == header)
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goto error;
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header = end;
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break;
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if (!parse_colorspace (param_value, &format)) {
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GST_ERROR_OBJECT (y4mdec, "Failed to parse colorspace: %s", param);
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return FALSE;
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}
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continue;
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case 'W':
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header++;
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width = strtoul (header, &end, 10);
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if (end == header)
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goto error;
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header = end;
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break;
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if ((width = strtoul (param_value, NULL, 10)) == 0) {
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GST_ERROR_OBJECT (y4mdec, "Failed to parse width: %s", param);
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return FALSE;
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}
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continue;
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case 'H':
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header++;
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height = strtoul (header, &end, 10);
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if (end == header)
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goto error;
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header = end;
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break;
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if ((height = strtoul (param_value, NULL, 10)) == 0) {
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GST_ERROR_OBJECT (y4mdec, "Failed to parse height: %s", param);
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return FALSE;
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}
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continue;
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case 'I':
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header++;
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if (header[0] == 0) {
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GST_WARNING_OBJECT (y4mdec, "Expecting interlaced flag");
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if ((interlaced_char = param_value[0]) == 0) {
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GST_ERROR_OBJECT (y4mdec, "Expecting interlaced flag: %s", param);
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return FALSE;
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}
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interlaced_char = header[0];
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header++;
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break;
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continue;
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case 'F':
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header++;
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fps_n = strtoul (header, &end, 10);
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if (end == header)
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goto error;
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header = end;
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if (header[0] != ':') {
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GST_WARNING_OBJECT (y4mdec, "Expecting :");
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if (!parse_ratio (param_value, &fps_n, &fps_d)) {
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GST_ERROR_OBJECT (y4mdec, "Failed to parse framerate: %s", param);
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return FALSE;
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}
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header++;
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fps_d = strtoul (header, &end, 10);
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if (end == header)
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goto error;
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header = end;
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break;
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continue;
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case 'A':
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header++;
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par_n = strtoul (header, &end, 10);
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if (end == header)
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goto error;
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header = end;
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if (header[0] != ':') {
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GST_WARNING_OBJECT (y4mdec, "Expecting :");
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if (!parse_ratio (param_value, &par_n, &par_d)) {
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GST_ERROR_OBJECT (y4mdec, "Failed to parse PAR: %s", param);
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return FALSE;
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}
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header++;
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par_d = strtoul (header, &end, 10);
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if (end == header)
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goto error;
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header = end;
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break;
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default:
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GST_WARNING_OBJECT (y4mdec, "Unknown y4m header field '%c', ignoring",
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*header);
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while (*header && *header != ' ')
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header++;
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break;
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continue;
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}
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GST_WARNING_OBJECT (y4mdec, "Unknown y4m param field '%s', ignoring",
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param);
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}
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g_strfreev (params);
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switch (iformat) {
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case 420:
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format = GST_VIDEO_FORMAT_I420;
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break;
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case 422:
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format = GST_VIDEO_FORMAT_Y42B;
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break;
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case 444:
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format = GST_VIDEO_FORMAT_Y444;
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break;
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default:
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GST_WARNING_OBJECT (y4mdec, "unknown y4m format %d", iformat);
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return FALSE;
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}
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if (width <= 0 || width > MAX_SIZE || height <= 0 || height > MAX_SIZE) {
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GST_WARNING_OBJECT (y4mdec, "Dimensions %dx%d out of range", width, height);
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if (width > MAX_SIZE || height > MAX_SIZE) {
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GST_WARNING_OBJECT (y4mdec, "Dimensions %lux%lu out of range", width,
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height);
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return FALSE;
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}
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@ -478,9 +485,6 @@ gst_y4m_dec_parse_header (GstY4mDec * y4mdec, char *header)
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y4mdec->info.par_d = par_d;
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return TRUE;
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error:
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GST_WARNING_OBJECT (y4mdec, "Expecting number y4m header at '%s'", header);
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return FALSE;
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}
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static GstFlowReturn
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